Khairunnida, R. Lubis, and R. Khair. “THE APPLICATION OF THE NET PROMOTER SCORE (NPS) METHOD IN MEASURING CUSTOMER SATISFACTION IN THE RETAIL INDUSTRY IN MEDAN”. Jurnal Ekonomi, vol. 12, no. 04, Oct. 2023, pp. 1556-61, https://ejournal.seaninstitute.or.id/index.php/Ekonomi/article/view/3250.